Power by upgraded rechargeable 300mAh battery, you can from a regular outlet, computer, any other device via a USB port This portable fan is powerful enough to generate strong wind You just need to press power button to change the 3 speed setting of the handheld fan This fan can fit into almost any handbag and your pocket You can pull it anythere out when you outdoor Quiet operated, the small fan rechargeable provide cool wind but never disturb you, which can be switches easily by press button Beating the heat wherever, whether work, home, traveling Our fan ensures you stay cooling